Chill



U ITED STATES PATENT OFFIC NATHANIEL S BOUTON, OF CHICAGO, ILLINOIS.

CHILL.

SPECIFICATION formingpart of Letters Patent No. 421,899, dated February 2 1890- Application filed September 2. 1889. Serial No. 322,693- (No model.)

To all whom it may concern.-

Be it known that I, NATHANIEL S. BOUTON, of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Chills, of which the following is a full, clcar, and exact specification.

My invention is applicable to numerous kinds of chills for producing hard surfaces upon castings, but is especially designed for use in the production of cast-iron car-wheels.

The object of my invention is to secure the contraction of the chills against the casting to be chilled so long as the condition of the casting will be effected by contact with the chill, the contraction being caused by the structure of the chill itself, thereby produclng a more perfect casting, having a much harder and more durable chill upon the surface than heretofore produced by the existing methods.

Among the chills heretofore made may be mentioned those which consist of a solid ring metal turned to a form the counterpart of the shape of the chilled surface desired to be produced. When the molten metal is poured into such a chill, there is contact between the metal and the chill only for a very short time afterthe metal has become solidified, the

. heat derived from the casting, the structure ring, by which to expand or contract the chill at will or to absorb the heat, have also beendcvised. These devices are improvements on the solid chill, in that the chillingsurface is held a little longer in contact with the casting to be chilled; but the remedy is only partially effective, and the use of steam and water involves additional expense. The

heat of the casting is soon communicated to.

the solid ring of the chill, which is thus increased in diameter and separated from the the casting.

To maintain the contact of the chill by making the movement caused by its expansion to practically all take place toward the face of the contracting casting is the ob ect of my invention.

My invention consists in the parts and combinations hereinafter described and claimed.

In the accompanying drawings, which form a part of this specification, Figure is a sectional plan of a chill constructed in accordance with my invention, the plane of section being indicated by line 1 1, Fig. 2 Fig. 1s a vertical section of the chill,.and Fig. 3 1s a section on line 3 3, Fig. 1.

A, Fig. :2, is the cope or top part of a flask for a car=wl1eel mold in which my improved chill is used.

B is the chill, and C the drag.

The cope and drag are in the main of the ordinary construction,being modified in some particulars to fit them for use with my 1mproved chill, as hereinafter described.

v The chill B is composed of an inner ring divided into sections D, and an outer supporting-ring, also divided into sections E, a Web F forming a connection from each inner section to the supporting-ring.

The supporting-ring may consist of a var able number of sections, but I have shown it as consisting of eight; but any other number, greater or less, whichwill attain the desired end may be used. The said SGClUlOIlS are held together by bolts or dowels G, which are fitted closely but not tightly in holes through lugs H H at the ends of the sections, thus forming sliding joints. The dowels may be arranged either as at G, Fig. 2, or G, the ob ject of arranging them as at G being to remove them farther from each other, and hence increase their steadying effect.

Attached to the outer ring, near the mid dle of each section E, is a lug I, (shown in dotted lines in Fig. 1,) by which each section is loosely fastened to the cope. I fasten the sections to the cope as a matter of convenience, not of necessity. The chill should not be rigidly attached to the cope. The lower edge of the outer ring fits within the flange J of the drag. This flange need not be continuous, but may consist of a number of lugs detached from each other. The sections D of the inner ring may be as numerous as experience teaches is necessrry.

The operation is as follows: \Vhen the molten metal is poured into the mold and comes in contact with the chill, the immediate eifect is to expand the sections of the inner ring, which, however, does not affect its diameter, because the spaces between the sections afford room for the expansion of the faces of the sections. The heat gradually extends from the sections D to the web F, and thence to the outer sections E. The expansion of the outer sections E does not result in an increase of the diameter of the outer ring, as it would do if the outer ring were continuous, for the spaces between them allow room for their circumferential expansion without their being thereby forced to move radially. The expansion of the webs F, therefore, is fully effective in decreasing the interior diameter of the chill, as it is not neutralized by the expansion or the outer ring, to which they are attached.

I claim- 1. The combination, in a mold for casting, of a chilling-surface divided into sections, a supporting-ring, also divided into sections having spaces between their ends, and a drag having a flange into which the said sectional supporting-ring is fitted, whereby the diametral expansion of said supporting-ring is prevented, substantially as shown and described.

2. The combination, in a chill, of a chillingsurface divided into sections, and a supporting-ring, also divided into sections having spaces between their ends, connections from the outer ring to the chilling-sections, and dowels forming a sliding joint at the ends of the sections, substantially as described.

NATHANIEL S. l'EO'U'ION.

Vitnesses:

IRWIN ,VEEDER, P. II. '1. Mason. 

